CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

Production/Dissipation Ratio

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   July 25, 2001, 13:45
Default Production/Dissipation Ratio
Posts: n/a
Hi everybody. Does anybody know what the ratio of production to dissipation looks like for adverse pressure gradient flows in the outer layer of a turbulent boundary layer? In a zero pressure gradient flow this asymptotes to 1, but for adverse pressure gradient the value is bigger. Any references? How does k-epsilon model predicted? Over or underpredictcs? I have some results which predict a higher ratio than standart k-epsilon. I need to verify this. Thanks in advance. John
  Reply With Quote

Old   July 25, 2001, 15:39
Default Re: Production/Dissipation Ratio
John C. Chien
Posts: n/a
(1). Prof. W. Rodi has published a paper many many years ago dealing with the adverse pressure gradient issue. (published in ASME?) (2). It's a short paper, but it has profile distribution vs his improved model. It's one of the early attempt to make the model more sensitive to the pressure gradient. (I think, the paper was published before mid-80's)
  Reply With Quote

Old   July 30, 2001, 22:18
Default Re: Production/Dissipation Ratio
clifford bradford
Posts: n/a
No doubt you can obtain info on this in David Wilcox's turbulence modelling book.
  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
[ICEM] Error in Prism Ratio Computed singer1812 ANSYS Meshing & Geometry 0 September 22, 2011 16:29
pressure eq. "converges" after few time steps maddalena OpenFOAM Running, Solving & CFD 69 July 21, 2011 07:42
diesel spray combustion equivalence ratio usker Siemens 12 March 1, 2008 07:09
High Aspect Ratio elements Flavio CFX 2 November 24, 2006 13:01
Problem of Turbulent Viscosity Ratio Limited David Yang FLUENT 3 June 3, 2002 06:13

All times are GMT -4. The time now is 14:16.